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08 Jan 2020, 03:31
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Be sure to select an answer first to save it in the Error Log before revealing the correct answer (OA)!
Difficulty:
35%
(medium)
Question Stats:
74% (02:10) correct
26%
(02:47)
wrong
based on 352
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Two boats, traveling at 5 and 10 kms per hour, head directly towards each other. They begin at a distance of 20 kms from each other. How far apart are they (in kms) one minute before they collide?
(A) 1/12
(B) 1/6
(C) 1/4
(D) 1/3
(E) 1/2
(A) 1/12
(B) 1/6
(C) 1/4
(D) 1/3
(E) 1/2
08 Jan 2020, 04:28
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IMO 1/4 km. or 250 mtrs.
Sol:
We only need to find out the distance traveled by both the boats in 1 min ie. 10+5=15 kmph or (15*1000)/60
This gives us 250 mtr of 1/4 km. this is the solution.
The wording of the question may confuse the test taker as one might think that she has to calculate total time and then subtract 1 min and then do the math.
but its just as simple as calculating the total dist traveled in 1 min.
Sol:
We only need to find out the distance traveled by both the boats in 1 min ie. 10+5=15 kmph or (15*1000)/60
This gives us 250 mtr of 1/4 km. this is the solution.
The wording of the question may confuse the test taker as one might think that she has to calculate total time and then subtract 1 min and then do the math.
but its just as simple as calculating the total dist traveled in 1 min.
BhishmaNaidu99
08 Jan 2020, 06:46
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We can simply calculate the distance traveled for one min , as the final distance is same as the distance in that one min
d = s* t
d = (5+10) * 1/60 = 15 / 60 = 1/4 km
d = s* t
d = (5+10) * 1/60 = 15 / 60 = 1/4 km
